The phrase "a source of problem" is not correct in standard written English.
The correct expression should be "a source of problems" to indicate multiple issues or "a source of the problem" to refer to a specific issue.
Example: "The lack of communication was identified as a source of the problem in the project."
Alternatives: "a cause of issues" or "a contributor to the problem."
On the premise that all publicity is good publicity, it has been a great European tour for Mr. Bieber, who has been "a source of problems wherever he goes," according to Grazia, a French style magazine.
Might the role of Williams, whose belated decision to spill the beans to the ERC tribunal led to Richards' resignation, be a source of problems within the playing group?
Chunks of space debris become a permanent part of Smallville's environment; where kryptonite, in the past, was only a source of problems for Superman, in "Smallville" it can (and does) affect almost everyone in one bizarre way or another, transforming what was once a peaceful farm town into "the weird capital of the world".
"Our concern comes from what we experienced in our history where governments in the 1980s developed local militias that then became a source of problems for law and order in the country," he said, noting that the Soviets, who then ruled Afghanistan through local proxies, created armed local forces that provoked anti-Soviet forces to rebel against them.
On the other hand, a source of problems in naval reactors across history is the steam generation function.
A source of problems caused by the presence of a shear force is explained and a way of overcoming it is shown.
Cost estimation of software projects is an important activity that continues to be a source of problems for practitioners despite improvement efforts.
Herbaceous biomass like Cynara is commonly high in potassium, chlorine and ash, which has been reported as a source of problems for combustion applications.
